Method of straightening tubes and rods.



J. E. FSGHER.

TRUE DE" STRAIG HTENNQ TUBES AND RODS= APPLGATIGN TLED APE. 22, i910.

77 @Mina JSEPH B. FISCHER, OF CHICAGO, ILLINOIS.

.METHODIOF STRIGHTENING TUBES AND RODS.

To all whom ti may-concern:

le it known 'that-'1, -JosErI-I B.' FIseHER, citizen of. the UnitedStates, residing' at i Chicagoiin the county vofCoolz and State ofIllinois, haveinif'ent'ed certain newand useful Improvements in Methods`of Straightening Tubes and Rods, vof which the fol-lowing uspecifieation'.

This invention relates to improvements in methods of'straightening bentor distorted metal tubes or rods, and especially those that losethe'r'shape as a result of harbetween'the two sections..-

r4tollmtritrgg detailed description.

Yln vthe aeeonipanying' drawing I have )Busti-ated a tube-urns distortedtorni and shown-tlm relative arrznigelnent of sneh tube und itsstruiglitener tube. vl ln the following views-Figure 1 shows a distortedtube as it appears after the hardening bath; Fig. @shows thestraightener tube, and Figli shows the relative arrange'- nient ot thedistorted and theY straightener tube when the former isv being insertediny the latter; Fig. is a side elevation of'a tube carrying frame.

Referring to the ldrawingin detail'7 4; represents a section of thinnietal tubing which has become distorted as a result-ot its harideni'ngbatl. and subseqllent cooling. l

5 represents a section ot'straight 'tubing otlieavier gag-e than thesection il, and with 'its innercross-diameter slightly7 greater than theexternal cross diameter of the tube section l so 'that there will be atight shdm-gi'fit lSpecification of Letters Patent Yout drawing itstemper beyond In testimony Patented Jan. i0, ML

Applicationiled Apr122, 1910. Serial No. 556,957.

To straighten the tube "si, I push it into the tube 5 until all of thedistorted portion of the former is surrounded by the latter,

and in this position, I place both tubes in an'oven -haif'ing a'temperature oi2 about 500 or more degrees Fahr. and leave them thereuntil heated through, when they are witlidrawn and allowed to cool. andwhen cooled theinner tube will be straight and true and will have itsproper tcn'n'ier.

Where a number of tubes are to be straightened they may be placed in asuitable trarne G having registering holes to receive the outer tubes sothat the hot air may freely circulate around the tubes and they maybeconveniently handled in bulk.

It will be.apparent that distorted rods may be straightened in themanner described, it beingnecessary only to n'olong the period ofexposure to the hot. air ot the oren.-

Having thus described luy invention what l claim as new, is

l. A Inethod oi straightening a distorted tube which consists ininserting suoh tube in. a straigl'it tube haring thicker walls than theinserted tube. and tilting tightly around the latter. und thensubjecting the tubes .so arranged to Yn telnlwratiufe whirh will besnllivient'y to straighten theinner tube with- A the temper desired.

Q. A method ot straightening a, tube dis-v torted as ay result ofhardening, which consists in inserting such tube in asti-aight tubehaving substantially thicker walls than the inserted tube. andtittingtightly around the latter, and then subjecting the asseml'wledtubes to a temperature otl about 50() or more 'degrees Fahr. as inay'berequired.

i whereof l ailix my signature in the ypresence of two witnesses.

Amano VissoHEn, RUTH L. vVoonuons'r.

